ASUS and NEC drive, which one for reading / writing

I’ve got 2 drives in my PC at the moment: Asus DRW-1814BLT 18x S-ATA and the NEC AD-7173S 18x S-ATA.

I wanna copy a few DVD’s on the fly.

Which of these two should I choose for the reading and which one for the writing?

Which is the best for reading and which is the best for writing?

I think the NEC is better for reading and the ASUS for writing, but I wanted the opinion off the experts (I’m out of the burning business for a while :frowning: )